WO2019093240A1

WO2019093240A1 - Endoscope hood removal tool, and set of hood and hood removal tool

Info

Publication number: WO2019093240A1
Application number: PCT/JP2018/040856
Authority: WO
Inventors: 憲幸杉田
Original assignee: Hoya株式会社
Priority date: 2017-11-13
Filing date: 2018-11-02
Publication date: 2019-05-16
Also published as: CA3074186A1; US11583167B2; US20200187757A1; JP6756055B2; DE112018004155T5; CA3074186C; JPWO2019093240A1

Abstract

A removal tool according to the present invention for removing a hollow cylindrical hood mounted to a distal-end part of an endoscope from the distal-end part is constituted from a flexible member provided with a hole-shaped recess inside which the hood can be stored. A level-difference part is provided on the outer surface of the hood so as to extend along the circumferential direction of the hood. An engaging part shaped so as to engage with the level-difference part and grasp the hood as a result of deformation of the flexible member is provided on an inner wall surface of the recess in a position facing the level-difference part when the hood is stored in the recess.

Description

Endoscope hood removal jig and set of hood and hood removal jig

The present invention relates to a hood removal jig to be attached to a distal end portion of an endoscope, and a set of a hood and a hood removal jig.

The distal end portion of the insertion portion of the endoscope is provided with an opening for capturing an image of biological tissue provided at the distal end portion and an emission port for illumination light for illuminating the biological tissue, and these openings and the emission port are provided. A hood is attached to prevent it from being soiled by the kimono. The hood is a hollow cylindrical tubular member formed of a resin material. A treatment tool such as a lesion is treated by projecting various treatment tools such as biological forceps and brushes for collecting cells, forceps for removing foreign matter, washing pipes and injection needles from the opening of the tip of the hood. . In addition, since the tip of the hood is tapered, it can be easily inserted into the pharynx, stomach, colon, duodenum, esophagus, etc., and damage to mucous membranes and blood vessels can be prevented. In addition, this hood also plays a role of securing a good observation area while maintaining a constant observation distance from the tip of the endoscope. Such a hood is strongly pressed into the tip of the insertion portion of the endoscope so as not to be easily detached when it is inserted into the human body.

On the other hand, it is known that a female screw is provided on either the inner surface of the hood or the outer surface of the tip of the endoscope, and the other has a male screw to be screwed with the female screw. (Patent Document 1). This technique can prevent the hood from being easily detached when inserted into the human body.

Patent No. 5404258 gazette

However, in such a form in which the hood and the tip end are screwed together, the endoscope capable of mounting the hood is limited to an endoscope provided with a female screw portion or a male screw portion at the tip portion. The use of a hood provided with internal threads is limited. In addition, in some types of endoscopes, for example, endoscopes for large intestine examination, a lubricant is added to the insertion portion including the distal end portion and the hood so as to facilitate insertion when inserting the insertion portion of the endoscope into the large intestine. Is applied. For this reason, in the form in which the hood and the tip end are screwed together, it is difficult to pinch and rotate the hood to which the lubricant adheres and remove it from the tip end. Moreover, since the endoscope operator wears gloves in hand to prevent infection, removal of the lubricant-attached hood becomes more difficult. In addition, it is difficult to break the hood to which the lubricant adheres and to remove the hood from the tip.
For this reason, a technique is desired that can easily remove the hood from the tip of the endoscope.

Therefore, according to the present invention, a hood removal jig for an endoscope having a structure capable of easily removing the hood fixed by press fitting to the tip of the endoscope from the tip of the endoscope, and removing the hood and the hood The purpose is to provide a set of jigs.

One aspect of the present invention is a removal jig for removing the hood of the endoscope from the tip of the endoscope. The hood of the endoscope is mounted on the outer peripheral surface of the distal end portion of the endoscope, and has a hollow cylindrical shape provided with a step portion on the outer surface so as to extend in the circumferential direction.
The removal jig is constituted by a flexible member provided with a hole-like concave portion capable of internally accommodating a portion including the step portion of the hood.
The inner wall surface of the recess has a shape that engages with the step by deformation of the flexible member at a position facing the step when the hood is stored in the recess, and holds the hood An engaging portion is provided.

When the flexible member is not deformed, the inner diameter of the portion of the engaging portion provided on the inner wall surface is compared with the outer diameter of the stepped portion so that the engaging portion does not engage with the stepped portion. Is preferably large.

Another aspect of the present invention is a set of a hollow cylindrical endoscope hood attached to the outer peripheral surface of the distal end portion of the endoscope and a removal jig for removing the hood from the distal end portion. is there.
A stepped portion is provided on the outer surface of the hood so as to extend along the circumferential direction,
The removal jig is constituted by a flexible member provided with a hole-like concave portion capable of internally accommodating a portion including the step portion of the hood.
The inner wall surface of the recess has a shape that engages with the step by deformation of the flexible member at a position facing the step when the hood is stored in the recess, and holds the hood An engaging portion is provided.

The stepped portion is provided to go around the outer surface of the stepped portion,
It is preferable that the engaging portion be provided to go around the inner wall surface.

A groove extending along the circumferential direction and closed at both ends is provided as the step on the outer surface of the hood,
It is also preferable that a projection rib intermittently and circumferentially extended so as to correspond to the groove is provided as the engagement portion on the inner wall surface of the recess.

The removal jig is a packing container for storing the hood, a storage chamber for storing the hood of the packing container is the recess, and the engaging portion is provided on an inner wall surface surrounding the storage chamber of the packing container. Preferably, it is provided.

Further, the flexible member is an elastic member,
The engaging portion contacts the outer surface before the hood enters the recess from the tip of the hood and the stepped portion reaches the position of the engaging portion, and the inner diameter of the engaging portion is In order to expand, the hood has a configuration in which the outer diameter of a part of the outer surface increases in the direction from the tip toward the opposite rear end, or the removal jig is in the recess The inner diameter of a part of the wall surface is configured to decrease in the direction from the inlet of the recess toward the back side,
When the stepped portion reaches the position of the engaging portion, the engaging portion is restored by the elastic force generated by the expansion deformation of the inner diameter of the engaging portion, whereby the engaging portion and the stepped portion are engaged. It is also preferred that it is configured to

The hood comprises: a cylindrical main body; and a plurality of projecting elements projecting in different directions radially outward from the outer surface of the main body,
The storage chamber of the packaging container has a columnar recess for receiving the main body portion, and a groove width and a groove depth capable of positioning and receiving each of the projecting elements, and the protrusion from the columnar recess is the protrusion And a plurality of receiving grooves projecting in different directions in the radial outer direction to correspond to the elements.

Preferably, at least in part of the receiving groove, the dimension of the groove depth is greater than the dimension of the corresponding thickness of the projecting element.
The portion of the groove depth dimension being greater than the corresponding thickness dimension of the projecting element is configured to accommodate at least the base of the projecting element that begins projecting from the body portion preferable.
The recess preferably has a hole bottom, and the distance from the hole bottom to the engagement portion is preferably equal to or greater than the distance from the tip of the hood to the step portion.

According to the above-described hood removal tool of the endoscope and the set of the hood and the hood removal tool, the hood fixed to the tip of the endoscope by press fitting can be easily removed from the tip of the endoscope Can.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view of the medical endoscope of one embodiment. It is a figure explaining the hood for endoscopes of one embodiment. It is an appearance perspective view of an example of the removal jig of one embodiment. (A), (b) is a figure explaining an example of the form of the removal jig | tool in another one Embodiment, and a hood. (A), (b) is a figure explaining an example of the form of the removal jig | tool in another one Embodiment, and a hood. (A)-(d) is a figure explaining the removal jig | tool of other one further embodiment, and mounting | wearing to the front-end | tip hard part of a food | hood. (A) to (e) are diagrams for explaining the removal jig of the embodiment shown in FIG. 6 and the removal of the hood from the rigid end portion. It is a figure explaining the shape of the hood of other one embodiment. It is a figure explaining the usage method of the food of one embodiment. (A), (b) is a figure explaining the packing container which accommodates the protrusion element of the food which is one embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a medical endoscope according to an embodiment. In the front-rear direction in the following description, the front end side of the flexible tube 1 of the endoscope is defined as “front”, and the front end side (connector portion 7 side) of the universal tube 6 is defined as “rear”.

A medical endoscope includes a control unit 3, a flexible tube 1 extending forward from the control unit 3 and having flexibility, and a curved tube connected to the front of the flexible tube 1 via a connecting unit 10. 2, a universal tube 6 extending rearward from the operation unit 3, and a connector 7 fixed to the rear end of the universal tube 6. A plurality of bending operation wires are inserted into the operation unit 3, the flexible tube 1 and the bending tube 2. The distal end of each bending operation wire is connected to the rear end of the distal end hard portion 5, and the rear end of each bending operation wire is connected to the bending operation lever 4 (a bending operation mechanism) of the operation unit 3. The bending tube 2 bends in any direction according to the operation of the bending operation lever 4 by an arbitrary angle.

A distal end rigid portion 5 is provided at the distal end portion of the curved tube 2. The distal end hard portion 5 is substantially made of a hard resin material which can not elastically deform (for example, ABS (acrylonitrile butadiene styrene), modified PPO (modified polyphenylene oxide), PSU (polysulfone), etc.) An opening including an objective lens (observation lens), an exit through which an illumination lens is provided, an air / water supply port, a forceps port, and the like are provided on a front end surface of the flat surface 5. When the air supply / water supply opening widens the patient's lumen by air supply to secure the field of view, water is jetted if the surface of the objective lens becomes dirty due to body fluid or bleeding and the observation performance of the endoscope decreases. When removing the dirt on the lens surface and sending air to recover the field of view by dropping water droplets on the objective lens surface, air is also blown to the surface of the treatment object to make a clear observation image of the treatment object Use when acquiring. The forceps port is used when performing biopsy and treatment using various treatment tools, and when sucking out body fluid, blood, water jetted from an air supply / water supply port, and the like.

Inside the operation unit 3, the flexible tube 1, the curved tube 2, the universal tube 6 and the connector unit 7, a light guide fiber (not shown) whose front end is connected to the illumination lens is provided. Furthermore, an imaging device (not shown) located immediately after the objective lens is provided in the inside of the distal end hard portion 5, and the image signal cable extending from the imaging device includes the curved tube 2, the flexible tube 1, the operation unit 3 and the universal It extends to the inside of the connector portion 7 through the inside of the tube 6. The connector unit 7 is connected to an endoscope processor (not shown). The endoscope processor processes an image signal sent from an imaging device and controls to display an image of a subject captured by the imaging device on a monitor (not shown).

FIG. 2 is a view for explaining the endoscope hood 20 according to one embodiment. The hood 20 is strongly pressed into and attached to the distal end hard portion 5 of the endoscope. The hood 20 prevents the illumination lens and the objective lens from being soiled with adhesions, and can be easily inserted into the pharynx, stomach, colon, duodenum, esophagus, etc., and can prevent damage to mucous membranes and blood vessels. In addition, this hood functions to secure a good observation area while keeping the observation distance from the distal end hard portion 5 of the endoscope constant.

The hood 20 has a hollow cylindrical shape, and is mounted on the outer peripheral surface of the distal end hard portion 5 so as to protrude from the distal end hard portion 5. A stepped portion 24 is provided on the outer surface 22 of the hood 20 so as to extend in the circumferential direction. The hood 20 is formed of a resin material such as polyphenylene oxide or polyphenyl sulfone. The stepped portion 24 is a step whose outer diameter decreases from the front end side to the rear end side of the hood 20.

Such a hood 20 is strongly pressed so as not to be separated from the distal end hard portion 5 in the body cavity, so as described above, when recovering the endoscope from the body cavity and removing the hood 20, removal is easy There are times when you can not The hood 20 is coated with a lubricant in order to improve the sliding of the endoscope in the body cavity, so that the hood 20 also has a lubricant. Therefore, even if the hood 20 is pinched and removed from the distal end rigid portion 5, it may not be easily removed.
For this reason, in the present embodiment, a removal jig 30 for removing the endoscope hood 20 from the distal end hard portion 5 is provided.

FIG. 3 is an external perspective view of an example of the removal jig 30.
The removal jig 30 is formed of a flexible member provided with a hole-like concave portion 32 capable of housing the portion including the step portion 24 of the hood 20 inside. The removal jig 30 is provided with a flat plate portion of a certain thickness around the recess 32. The recess 32 is recessed in a direction perpendicular to the plane of the flat plate portion. According to one embodiment, the removal jig 30 is preferably a shell-like member. The hole bottom 33 is provided in the hole which is the recess 32. As shown in FIG. 3, when the hood 20 is housed in the recess 32 on the inner wall surface 34 of the recess 32, for example, the front end of the hood 20 faces the step 24 when it abuts the hole bottom 33. At a position, an engagement portion 36 capable of engaging with the step portion 24 of the hood 20 is provided. The engaging portion 36 is shaped so as to be engaged with the step portion 24 and grip the hood 20 when the flexible member of the removal jig 30 is deformed by receiving a force from the outside. According to one embodiment, the shape of the engaging portion 36 is preferably a step shape corresponding to the step portion 24. In this case, the step shape is a step shape in which the inner diameter is wide on the back side of the recess 32 and the inlet side of the recess 32 is narrow.

When the hood 20 is moved into the recess 32 so that the tip of the hood 20 mounted on the tip hard portion 5 abuts on the hole bottom 33, the step 24 completely opposes the engaging portion 36. The engagement portion 36 may be separated on the inlet side of the hole with respect to the step 24. The engagement portion 36 is provided so that the step portion 24 when the hood 20 is stored in the recess 32 can face the engagement portion 36.
The flexible member is preferably an elastic member, because the engagement portion 36 is engaged with the step portion 24 to hold the hood 20 by utilizing the deformation of the removal jig 30. For example, it is made of an elastic resin material or the like.

FIGS. 4A and 4B illustrate an example of how to remove the hood in one embodiment using a hood removal jig.
FIG. 4A shows a state in which the hood 20 is inserted into the recess 32 such that the tip of the hood 20 mounted on the tip rigid portion 5 abuts on the hole bottom 33. At this time, the inner diameter of the portion of the engaging portion 36 provided on the inner wall surface 34 is the outer diameter of the step portion 24 so that the engaging portion 36 does not engage with the step portion 24 when the flexible member is not deformed. It is preferable to be larger than. Here, the inner diameter of the engagement portion 36 refers to the narrowest dimension of the inner diameter when the engagement portion 36 forms a step, and the outer diameter of the step 24 is the widest dimension of the outer diameter. Say. Thus, the hood 20 can be advanced into the recess 32 without receiving unnecessary resistance from the engaging portion 24 until the tip of the hood 20 attached to the tip hard portion 5 abuts on the hole bottom 33. Therefore, the inner diameter from the engaging portion 36 to the inlet of the recess 32 is preferably larger than the outer diameter of the step 24. The AA arrow cross section shown on the right side of FIG. 4A is a cross section at a position on the inlet side of the recess 32 compared to the engaging portion 36. As shown, an air gap exists between the outer surface of the hood 20 and the inner wall surface 34 of the recess 32.

FIG. 4B shows a state in which the tip of the hood 20 abuts on the hole bottom 33 and the removal jig 30 is deformed. As shown in FIG. 4B, by applying an external force F to a portion between the engaging portion 36 of the removal jig 30 and the entrance of the recess 32, for example, this portion is sandwiched by fingers, in the figure, up and down. If the above portion is deformed as shown in FIG. 4 (b) by applying an external force F from the direction (refer to the AA arrow cross section shown on the right in FIG. 4 (b)), The inner diameter along the direction in which the external force F is applied is also narrowed in the engaging portion 36 located in the vicinity of the portion. For this reason, when the distal end hard portion 5 is taken out (pulled out) from the concave portion 32 in a deformed state, the step portion 24 and the engagement portion 36 are engaged, and the removal jig 30 grips the hood 20. Therefore, the hood 20 is removed from the distal end hard portion 5 by taking out the distal end hard portion 5 from the recess 32.

As described above, since the inner wall surface 34 of the concave portion 32 is provided with the engaging portion 36 having a shape to be engaged with the step portion 24 by the deformation of the inner wall surface 34 of the flexible member and grip the hood 20, Even when the lubricant adheres to the hood 20, the hood 20 can be easily removed from the distal end hard portion 5 by taking out the distal end hard portion 5 from the concave portion 32 while holding the hood 20. .

In the embodiment shown in FIGS. 4A and 4B, the stepped portion 24 is provided on the outer surface of the hood 20, and the engaging portion 30 is provided on the inner wall 34 of the removal jig 30. Configuration. The configuration in which the step portion 24 and the engaging portion 30 make a circuit around the outer surface and the inner periphery allows the hood 20 to enter the recess 32 without worrying about the circumferential position of the step portion 24 and the engaging portion 36. Preferably, the step portion 24 and the engagement portion 36 can be engaged simply by causing the step portion 24 and the engagement portion 30 to be intermittently provided on the outer surface and the inner periphery according to one embodiment. Is also preferred. In this case, in order to engage the step portion 24 with the engaging portion 36, the distal end hard portion 5 and the hood 20 are rotated relative to the removal jig 30 so that the step portion 24 and the engaging portion 30 are engaged. The engagement is performed.

FIGS. 5A and 5B are diagrams for explaining an example of the form of the removal jig 30 and the hood 5 according to another embodiment. 5A and 5B show cross sections of the removal jig 30, the hood 20, and the distal end hard portion 5 at positions where the step portion 24 and the engagement portion 30 face each other.
On the outer surface of the hood 20, there are provided four step portions 24 extending in the circumferential direction intermittently at a certain distance from the tip of the outer surface of the hood 20 and having grooves closed at both ends. There is.
On the other hand, the inner wall surface 34 of the concave portion 32 of the removal jig 30 is intermittently extended in the circumferential direction so as to correspond to the groove of the step portion 24, that is, a predetermined length is extended along the circumferential direction. There are four engaging portions 36 formed of projecting ribs.

Also in such an embodiment, as shown in FIG. 5B, the engaging portion 36 is deformed by applying an external force F in the vicinity where the stepped portion 36 is provided, so that the stepped portion 24 and the engaging portion 36 are formed. And the hood 20 which has entered the recess 32 can be grasped, so that the hood 20 can be easily removed from the tip hard portion 5 by taking out the tip hard portion 5 from the recess 32.

In this case, the circumferential length of the groove of the step portion 36 is preferably longer than the circumferential length of the projecting rib of the engaging portion 36. For example, the length along the circumferential direction of the groove of the step portion 36 is preferably more than 100% and 120% or less of the protruding rib of the engaging portion 36. While one end of the protruding rib of the engaging portion 36 abuts on the closed end of the groove of the step portion 36, the hood 20 and the distal end hard portion 5 are rotated relative to the removal jig 30, The distal end hard portion 5 can be pulled out of the recess 32. Thus, even when the degree of press-fitting of the hood 20 into the distal end hard portion 5 is strong, the hood 20 can be pulled out from the distal end hard portion 5 while relatively rotating the hood 20 and the distal end hard portion 5. By rotating and pulling out, the hood 5 can be easily removed from the distal end hard portion 5 like a wine cork stopper.

6 (a) to 6 (d) and FIGS. 7 (a) to 7 (e) show the removal jig 30 according to still another embodiment, the attachment of the hood 20 to the distal end hard portion 5, and the distal end of the hood 20. It is a figure explaining removal from hard part 5. 6A to 6D illustrate an example in which the hood 20 is attached to the distal end hard portion 5, and FIGS. 7A to 7E illustrate an example in which the hood 20 is removed from the distal end hard portion 5. ing.

The removal jig 30 is a packing container which accommodates the hood 20. As shown in FIG. 6A, a seal member 40 for sealing the hood 20 is attached around the entrance of the hole of the recess 32 of the removal jig 30. Such packaging containers are provided as consumables. An engaging portion 36 is provided on the inner wall surface 34 surrounding the recess 32 which is a storage chamber of the packaging container.

When the hood 20 in the packaging container is attached to the distal end hard portion 5, the seal member 40 is peeled off, and as shown in FIGS. 6 (b) and 6 (c), the hood 20 is housed in the distal end hard portion 5. The distal end hard portion 5 is pressed into the cylindrical shape of the hood 20 by entering into the recess 32. When the flexible member of the mounting jig 30 is not deformed, as shown in the enlarged view of the area D on the lower side of FIG. 6C, the engaging portion 36 does not engage with the step portion 24. The inner diameter of the portion of the engaging portion 36 provided on the wall surface 34 is larger than the outer diameter of the stepped portion 24. For this reason, when the hood 20 pressed into the distal end hard portion 5 is taken out from the recess 32, the step portion 24 does not engage with the engaging member 36 and a gap is formed, as shown in FIG. The distal end rigid portion 5 to which the hood 20 is attached can be taken out so as not to be caught on the engagement portion 36.

When the hood 20 is removed from the tip rigid portion 5 to which the hood 20 is attached, as shown in FIGS. 7A and 7B, the tip rigid portion 5 to which the hood 20 is attached is formed into the recess 32 of the packaging container. Then, the tip of the hood 20 abuts on the bottom 33 of the recess 32. At this time, as shown in FIG. 7C, an external force F is applied to a portion on the inlet side of the position where the engaging portion 36 of the removal jig 30 is provided to deform. Since the step portion 24 engages with the engagement portion 36 by this deformation, the removal jig 30 can hold the hood 20. Therefore, as shown in FIG. 7 (d), the distal end hard portion 5 is pulled out from the recess 32 in a state where the application of the external force F is maintained, as shown in FIG. 7 (e), by the removal jig 30. The gripped hood 20 can be removed from the distal end rigid portion 5. According to one embodiment, the distance from the hole bottom 33 to the engagement portion 36 (for example, the groove position or the step position of the engagement portion 36) is equal to or greater than the distance from the tip of the hood 20 to the step portion 24 (step position). Is preferred.

As described above, when the hood 20 is removed from the distal end hard portion 5, the step portion 24 engages with the engaging portion 36 and the hood 20 is gripped by the removal jig 30, so the hood 20 can be easily removed from the distal end hard portion. 5 can be removed. In addition, since the hood 20 is not gripped directly with a finger or gripped with a glove, adhesion of the lubricant to the finger or the glove can be suppressed.

FIG. 8 is a view for explaining the shape of the hood 20 according to one embodiment. FIG. 9 is a diagram for explaining how to use the hood 20 according to an embodiment. The hood 20 shown in FIG. 8 includes a hollow cylindrical main body portion 20a, and a plurality of projecting elements 20b projecting in different directions in the radial outer direction from the cylindrical outer surface of the main body portion 20a. The position of the protruding element 20b in the hood 20 is on the rear end side with respect to the stepped portion. The rear end side refers to the side opposite to the tip as viewed from the tip of the tip rigid portion 5 to which the hood 20 is attached. FIGS. 10 (a) and 10 (b) are diagrams for explaining the packing container for housing the projecting element 20b of the hood 20 according to one embodiment.

As shown in FIG. 9, an endoscope in which such a hood 20 is attached to the distal end hard portion 5 is inserted into a colon 60 or a body cavity such as the large intestine, and then the endoscope is pulled out of the body cavity. Observe the living tissue inside. At this time, there are a plurality of wrinkles in the large intestine etc., and in order to make a sharp examination of the presence or absence of the lesion, a flexible projecting element which can come in contact with the surface of the living tissue and curl up the wrinkles. 20b is provided on the hood 20. In such a configuration in which the hood 20 is pressed into and fixed to the distal end hard portion 5 of the endoscope, the hood 20 receives force in the direction in which it is separated from the distal end hard portion 5 in the body cavity. The degree of press-fit to the distal end hard portion 5 is higher than in the prior art. According to one embodiment, in order to remove the distal end hard portion 5 from the hood 20 with the removal jig 30 gripping the hood 20, the gripping force with which the removal jig 30 grips the hood 20 is the distal end hard portion 5 The sliding force must be able to withstand without slipping, and the gripping force to withstand this pulling force is preferably 20 N to 100 N, and particularly preferably 50 to 100 N.

Further, according to one embodiment, in order to realize the gripping force, the shape and dimensions of the engaging portion 36 corresponding to the step 24, for example, the height dimension of the step in the engaging portion 36 shown in FIG. The groove depth shown in FIGS. 5A and 5B is preferably 0.5 mm or more, and more preferably 1.0 mm or more. The upper limit values of the step size and the groove depth size are limited because the deformation of the mounting jig 30 caused by the application of the external force F is limited. According to one embodiment, the step size is preferably 5.0 mm or less, and more preferably 3.0 mm or less.

Such a hood 20 is housed in a packaging container which doubles as a removal jig 30 shown in FIGS. 10 (a) and 10 (b). Hereinafter, the packaging container is denoted by the same reference numeral 30 as the removal jig. As shown in FIGS. 10 (a) and 10 (b), the storage chamber of the packing container 30 has a columnar recess for receiving the main body 20a, and a groove width and a groove capable of positioning and receiving each of the projecting elements 20b. And a plurality of receiving grooves 38 having a depth and protruding in different directions in the radially outer side so as to correspond to the protruding elements 20b from the columnar recess. The accommodation groove 38 is recessed in a groove shape in the direction orthogonal to the plane from the plane of the flat plate portion surrounding the recess 32 of the packaging container 30 (the removal jig 30).
In the example shown in FIG. 10A, the dimension of the groove depth of the receiving groove 38 is larger than the dimension of the corresponding thickness of the projecting element 20b in any part. Thus, the hood 20 is disposed in the packaging container 30 so as to position the projecting element 20b in the accommodation groove 38, and the hood 20 is fixed to the distal end hard portion 5 with the engaging portion engaged with the step portion of the hood 20. When the package container 30 is pulled out, movement of the packaging container 30 in the rotational direction relative to the hood 20 can be suppressed, and the hood 20 can be efficiently pulled out with a large pulling force. In order to suppress movement of the packing container 30 relative to the hood 20 in the rotational direction when the hood 20 is pulled out from the distal end hard portion 5, the groove depth dimension of at least a part of the accommodation groove 38 is the projecting element 20b. The configuration may be larger than the corresponding thickness dimension of. Also in this case, a portion where the dimension of the groove depth of the accommodation groove 38 is larger than the dimension of the corresponding thickness of the projecting element 20 b suppresses the movement of the packaging container 30 relative to the hood 20 in the rotational direction. The hood 20 can be efficiently pulled out with a large pulling force. For example, it is preferable that a portion where the dimension of the groove depth of the accommodation groove 38 is larger than the dimension of the corresponding thickness of the projecting element 20b accommodate the base of the projecting element 20b which starts to project from the main body 20a.

In the above-described embodiment, the inner diameter of the portion of the engaging portion 36 provided on the inner wall surface 34 is the stepped portion 24 so that the engaging portion 36 does not engage with the stepped portion 24 when the removal jig 30 is not deformed. As shown in FIG. 3 (a) and FIG. 5 (a), a gap is formed. However, when the step portion 24 and the engaging portion 36 face each other when the hood 20 is inserted into the recess 32, the step portion 24 and the engaging portion 36 are engaged by utilizing the restoration of the elastic deformation of the removal jig 30. Can be configured as well. According to one embodiment, the flexible member of the removal jig 30 is an elastic member, and before the hood 20 enters the recess 32 from the tip of the hood 20 and the step 24 reaches the position of the engaging portion 36 The outer diameter of a portion of the outer surface 22 is directed from the tip toward the opposite rear end so that the engaging portion 36 contacts the outer surface 22 of the hood 20 and the inner diameter of the engaging portion 36 expands. The inside diameter of a part of the inner wall surface of the recess 32 gradually decreases in the direction from the entrance of the recess 32 toward the back side. When the step portion 24 reaches the position of the engaging portion 36, the engaging portion 36 is restored by the elastic force generated by the expansion deformation of the inner diameter of the engaging portion 36, whereby the engaging portion 36 and the step portion 24 engage. Preferably, it is configured to Also in this case, when the engaging portion 36 comes to a position where the hood 20 is accommodated in the recess 32 and opposed to the step portion 24, the elastic member automatically restores with the step portion 24 when the engaging portion 36 comes back. Since the hood 20 can be engaged and gripped, the hood 20 can be easily removed from the distal end rigid portion 5 of the endoscope.

As mentioned above, although the removal jig of the hood of the endoscope of this invention and the set of the removal jig of the hood and the hood were demonstrated in detail, this invention is not limited to the said embodiment, It does not deviate from the main point of this invention Of course, various improvements and modifications may be made within the scope.

DESCRIPTION OF SYMBOLS 1 flexible tube 2 bending tube 3 operation part 4 bending operation lever 5 tip rigid part 6 universal tube 7 connector part 10 connection part 20 hood 20a main body part 20b projecting element 22 outer surface 24 step part 30 removal jig 32 recess 33 hole bottom 34 inner wall surface 36 engagement portion 38 storage groove 60 colon

Claims

A removal jig for removing the hood of a hollow cylindrical endoscope attached to the outer peripheral surface of the distal end portion of the endoscope and having a stepped portion extending along the circumferential direction on the outer surface from the distal end portion And
The removal jig is constituted by a flexible member provided with a hole-like concave portion capable of internally accommodating a portion including the step portion of the hood.
The inner wall surface of the recess has a shape that engages with the step by deformation of the flexible member at a position facing the step when the hood is stored in the recess, and holds the hood An engaging part which has is provided, The removal jig of the hood characterized by the above-mentioned.
When the flexible member is not deformed, the inner diameter of the portion of the engaging portion provided on the inner wall surface is compared with the outer diameter of the stepped portion so that the engaging portion does not engage with the stepped portion. The hood removal jig according to claim 1, wherein the hood is large.
A set of a hollow cylindrical endoscope hood attached to an outer peripheral surface of a distal end of the endoscope and a removal jig for removing the hood from the distal end,
A stepped portion is provided on the outer surface of the hood so as to extend along the circumferential direction,
The removal jig is constituted by a flexible member provided with a hole-like concave portion capable of internally accommodating a portion including the step portion of the hood.
The inner wall surface of the recess has a shape that engages with the step by deformation of the flexible member at a position facing the step when the hood is stored in the recess, and holds the hood An engaging part is provided, The set of the removal jig of the hood of an endoscope characterized by the above-mentioned.
When the flexible member is not deformed, the inner diameter of the portion of the engaging portion provided on the inner wall surface is compared with the outer diameter of the stepped portion so that the engaging portion does not engage with the stepped portion. The set of the hood of the endoscope according to claim 3 and the jig for removing the hood according to claim 3.
The stepped portion is provided to go around the outer surface of the stepped portion,
5. The set of hood and hood removal jigs for an endoscope according to claim 3, wherein the engagement portion is provided to go around the inner wall surface.
A groove extending along the circumferential direction and closed at both ends is provided as the step on the outer surface of the hood,
The endoscope hood according to claim 3 or 4, wherein a projecting rib intermittently and circumferentially extended so as to correspond to the groove is provided on the inner wall surface of the recess as the engaging portion. A set of hood removal jigs.
The removal jig is a packing container for storing the hood, a storage chamber for storing the hood of the packing container is the recess, and the engaging portion is provided on an inner wall surface surrounding the storage chamber of the packing container. A set of hoods and hood removal jigs for an endoscope according to any one of claims 3 to 6, provided.
The hood comprises: a cylindrical main body; and a plurality of projecting elements projecting in different directions radially outward from the outer surface of the main body,
The storage chamber of the packaging container has a columnar recess for receiving the main body portion, and a groove width and a groove depth capable of positioning and receiving each of the projecting elements, and the protrusion from the columnar recess is the protrusion The hood according to any one of claims 3 to 7, further comprising: a plurality of receiving grooves projecting in different directions in the radial direction so as to correspond to the elements. set.
The endoscope hood and hood removal according to claim 8, wherein at least a portion of the projecting element receiving groove, the dimension of the groove depth of the receiving groove is greater than the dimension of the corresponding thickness of the projecting element. Jig set.
Claim 6-A portion of the groove depth dimension greater than the dimension of the corresponding thickness of the projecting element is configured to receive at least the base of the projecting element that begins projecting from the body portion. The set of the hood of the endoscope described in 9 and the jig for removing the hood.
The recess has a hole bottom,
11. The endoscope hood according to any one of claims 3 to 10, wherein the distance from the bottom of the hole to the engaging portion is equal to or greater than the distance from the tip of the hood to the step portion. Jig set.